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Radius of outermost closed isobar
The radius of outermost closed isobar (ROCI) is one of the quantities used to determine the size of a tropical cyclone. It is determined by measuring the radii from the center of the storm to its outermost closed isobar in four quadrants, which is then averaged to come up with a scalar value. It generally delimits the outermost extent of a tropical cyclone's wind circulation.〔FRÉDÉRIC MOUTON and OLA NORDBECK. (Cyclone Database Manager. ) Retrieved on 2008-07-14.〕
Use of this measure has objectively determined that tropical cyclones in the northwest Pacific ocean are the largest on earth on average, with North Atlantic tropical cyclones roughly half their size.〔Robert T. Merrill. (A Comparison of Large and Small Tropical Cyclones. ) Retrieved on 2008-07-14.〕 Active databases of ROCI are maintained by the National Hurricane Center for systems tracked in the eastern north Pacific and north Atlantic basins.
==Database==
Active databases of ROCI are maintained by the National Hurricane Center for systems tracked in the eastern north Pacific and north Atlantic basins, within a database known as the Extended Best Track Database. The values are determined in real-time every six hours. The eastern north Pacific database runs from 2001 to present, while the north Atlantic database runs from 1988 to present.〔Mark DeMaria (2009). (Atlantic Extended Best Track Database. ) Colorado State University. Retrieved on 2009-06-14.〕 Other than these official databases, a global once-daily dataset was compiled for a 1984 research paper, which covered global tropical cyclones between 1957 and 1977.〔 Previously, a database was created to determine ROCI values for the western north Pacific ocean in 1972, using data from 1945 to 1968.〔K. S. Liu and Johnny C. L. Chan. (Size of Tropical Cyclones as Inferred from ERS-1 and ERS-2 Data. ) Retrieved on 2008-07-14.〕 Another database with additional ROCI information is currently being modified at the Hydrometeorological Prediction Center for use in matching ongoing tropical cyclones to past systems for the purposes of finding rainfall analogs to an ongoing event,〔David M. Roth and Kyle S. Griffin (2009-06-07). (Cliqr Rainfall Analog. ) Hydrometeorological Prediction Center. Retrieved on 2009-06-14.〕 which has fairly continuous data running back to 1959 for the north Atlantic ocean.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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